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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/errno.h>
#include <sys/mman.h>
#include <sys/fbdev.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <libgfx/gfx.h>
/*
* Initialize the libgfx context
*
* @res: Context pointer to be initialized
*/
int
gfx_init(struct gfx_ctx *res)
{
struct fbattr attr;
int fd, prot;
if (res == NULL) {
return -EINVAL;
}
/* Get framebuffer attributes */
fd = open("/ctl/fb0/attr", O_RDONLY);
if (fd < 0) {
gfx_log("could not open '/ctl/fb0/attr");
return fd;
}
read(fd, &attr, sizeof(attr));
close(fd);
res->fbdev = attr;
/* Open the framebuffer file */
res->fbfd = open("/dev/fb0", O_RDWR);
if (res->fbfd < 0) {
gfx_log("could not open '/dev/fb0'\n");
return res->fbfd;
}
/* Map the framebuffer into memory */
prot = PROT_READ | PROT_WRITE;
res->fb_size = attr.height * attr.pitch;
res->io = mmap(NULL, res->fb_size, prot, MAP_SHARED, res->fbfd, 0);
/* Did the mmap() call work? */
if (res->io == NULL) {
gfx_log("could not map framebuffer\n");
close(res->fbfd);
return -1;
}
return 0;
}
/*
* Cleanup all state and free the gfx
* context.
*/
void
gfx_cleanup(struct gfx_ctx *ctx)
{
if (ctx->io != NULL)
munmap(ctx->io, ctx->fb_size);
if (ctx->fbfd > 0)
close(ctx->fbfd);
}
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